That graphic is classic but sadly outdated. That graphic shows the Internet is approx. 23 Petabytes. I worked for a hospital system that had over 20 EXAbytes (1 Exabyte = 1,024 Petabytes) of EMC SAN disk. More than enough to store the Internet from this graphic.
FWIW, there’s no real way to calculate the exact size of publicly accessible data. The total amount of stored data, public and private, is probably incalculable in a “Graham’s Number” sort of way.
Thanks for the education. I just found someplace and thought it was funny enough to use in a reply comment.
However, what you say makes perfect sense. The total information out there on the WWW is not just incalculably large, it is also growing exponentially every second we breath.
Even if we could download all the information, by the time we no sooner clicked the finish button, the information would have grown exponentially again. So we could never ever keep up with it even if we tried.
That is why, try as they may, the governments will never be able to control the content on the web, short of shutting down all the servers or sabotaging the phone line system and disabling the satellites.